fixes flaky test IdleRatioScanPrioritizerTest (apache#5815)

Increased the run time numerator in the test so that changes in the idle
denominator caused by differing test execution times does not fail the test.

fixes apache#5809

Author: keith-turner

core/src/test/java/org/apache/accumulo/core/spi/scan/IdleRatioScanPrioritizerTest.java

@@ -41,9 +41,10 @@ public void testSort() {
     // Two following have never run, so oldest should go first
     scans.add(new TestScanInfo("a", Type.SINGLE, now - 3));
     scans.add(new TestScanInfo("b", Type.SINGLE, now - 8));
-    // Two following have different idle ratio and same last run times
-    scans.add(new TestScanInfo("c", Type.SINGLE, now - 16, 2, 10));
-    scans.add(new TestScanInfo("d", Type.SINGLE, now - 16, 5, 10));
+    // Two following have different idle ratio and same last run times. Give these larger run times
+    // than e and f so they always come after e and f as the idle time varies.
+    scans.add(new TestScanInfo("c", Type.SINGLE, now - 16, 2, 20));
+    scans.add(new TestScanInfo("d", Type.SINGLE, now - 16, 5, 20));
     // Two following have same idle ratio and different last run times
     scans.add(new TestScanInfo("e", Type.SINGLE, now - 12, 5, 9));
     scans.add(new TestScanInfo("f", Type.SINGLE, now - 12, 3, 7));